[Octave-bug-tracker] [bug #57245] "clear all" generates segfault if run before or after a plot

[Markus Mützel]

Follow-up Comment #35, bug #57245 (project octave):

There might be something broken with the locking mechanism for builtin
functions.
In Octave 5.1:

octave:1> __init_gnuplot__
octave:2>


In Octave 6.0:

octave:1> __init_gnuplot__ 
error: mlock: invalid use outside a function
octave:2> 


If I call "__init_gnuplot__" from inside a function, that function is locked
instead.

The "clear all" probably deletes the toolkit that should have been protected
by the mlock in F__init_gnuplot__.

jwe is already in the CC list. He'll probably understand why this is failing
now.

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